Housing Research Center

Serdang, Malaysia

Housing Research Center

Serdang, Malaysia
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Salih M.A.,Housing Research Center | Salih M.A.,Foundation of Technical Education | Abang Ali A.A.,Housing Research Center | Demirboga R.,Atatürk University | Al Bakri M.,University Malaysia Perlis
Advances in Environmental Biology | Year: 2013

In this paper, palm oil fuel ash (POFA) was used as the soul material to produce geopolymer binder. Sodium silicate mixed with sodium hydroxide was used as alkaline activator to activate the palm oil fuel ash. Activator concentration, curing temperature, setting time and workability represented by flow table test were studied for POFA paste to evaluate the utilization of this ash in geopolymer technology. Compressive strength was used to evaluate the strength of the paste in three different ages (7, 14, and 28) days. The results showed that alkali activation of palm oil fuel ash as a soul material with different activators concentration can produce paste with 30.75 MPa at the age of 28 days. The results showed good potential in palm oil fuel ash to be used as a promising material in geopolymer technology. © 2013 AENSI Publisher All rights reserved.

Hejazi F.,University Putra Malaysia | Hejazi F.,Housing Research Center | Shoaei M.D.,University Putra Malaysia | Shoaei M.D.,Housing Research Center | And 4 more authors.
Earthquake and Structures | Year: 2015

The yielding mechanisms of reinforced concrete (RC) structures are the main cause of the collapse of RC buildings during earthquake excitation. Nowadays, the application of earthquake energy dissipation devices, such as viscous dampers (VDs), is being widely considered to protect RC structures which are designed to withstand severe seismic loads. However, the effect of VDs on the formation of plastic hinges and the yielding criteria of RC members has not been investigated extensively, due to the lack of an analytical model and a numerical means to evaluate the seismic response of structures. Therefore, this paper offers a comprehensive investigation of how damper devices influence the yielding mechanisms of RC buildings subjected to seismic excitation. For this purpose, adapting the Newmark method, a finite element algorithm was developed for the nonlinear dynamic analysis of reinforced concrete buildings equipped with VDs that are subjected to earthquake. A special finite element computer program was codified based on the developed algorithm. Finally, a parametric study was conducted for a three-story RC building equipped with supplementary VD devices, performing a nonlinear analysis in order to evaluate its effect on seismic damage and on the response of the structure. The results of this study showed that implementing VDs substantially changes the mechanism and formation of plastic hinges in RC buildings. © 2015 Techno-Press, Ltd.

Hejazi F.,University Putra Malaysia | Hejazi F.,Housing Research Center | Zabihi A.,University Putra Malaysia | Jaafar M.S.,University Putra Malaysia | Jaafar M.S.,Housing Research Center
Soil Dynamics and Earthquake Engineering | Year: 2014

By advancing the technologies regarding seismic control of structures and development of earthquake resistance systems in the past decades application of different types of earthquake energy dissipation system has incredibly increased. Viscous damper device as a famous and the simplest earthquake energy dissipation system is implemented in many new structures and numerous number of researches have been done on the performance of viscous dampers in structures subjected to earthquake. The experience of recent severe earthquakes indicates that sometimes the earthquake energy dissipation devices are damaged during earthquakes and there is no function for structural control system. So, damage of earthquake energy dissipation systems such as viscous damper device must be considered during design of earthquake resistance structures.This paper demonstrates the development of three-dimensional elasto-plastic viscous damper element consisting of elastic damper in the middle part and two plastic hinges at both ends of the element which are compatible with the constitutive model to reinforce concrete structures and are capable to detect failure and damage in viscous damper device connections during earthquake excitation. The finite element model consists of reinforced concrete frame element and viscous damper element is developed and special finite element algorithm using Newmark's direct step-by-step integration is developed for inelastic dynamic analysis of structure with supplementary elasto-plastic viscous damper element. So based on all the developed components an especial finite computer program has been codified for "Nonlinear Analysis of Reinforced Concrete Buildings with Earthquake Energy Dissipation System". The evaluation of seismic response of structure and damage detection in structural members and damper device was carried out by 3D modeling, of 3 story reinforced concrete frame building under earthquake multi-support excitation. © 2014 The Authors.

Vaghei R.,Housing Research Center | Hejazi F.,Housing Research Center | Khanzaei P.,Housing Research Center | Taheri H.,Housing Research Center | And 2 more authors.
Proceedings of the 4th Asia-Pacific Conference on FRP in Structures, APFIS 2013 | Year: 2013

In the last two decade, Industrialized Building System (IBS) was promoted to enhance the importance of prefabrication technology rather than conventional method in construction. The components of IBS structure are floors, walls, columns, beams, and roofs which are assembled and erected on the site properly joined to form the final units. Among all the components, connection has the most influential role to join all elements together such as wall to wall, slab to wall and wall to foundation for transferring the earthquake lateral loads. In the present study, an efficient FRP retrofit scheme for IBS wall connection has been developed in order to provide adequate strength and stiffness for wall connection to be resisting against the lateral seismic load. For this purpose, the inter-storey deformations of FRP strengthened infill walls which are integrated to the boundary frame members is evaluated by numerical analysis. So, the analytical model of wall and connection is developed and FRP retrofit design and analysis for actual deficient RC wall subjected to huge ground motion is conducted. From the analysis result, it was observed that application of the FRP composite retrofit scheme reduced the damage induced to deficient wall by controlling story deformations. So in this case, it is possible to satisfy the collapse prevention performance state through an efficient and economical manner. © 2013 International Institute for FRP in Construction.

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